St. Johns, Illinois 7 Day & Night Forecast & Conditions

Current Conditions

Maps Alerts Climate Index

Clear 68°F 20°C	Observed at: St. Johns, IL	Elevation: 546 ft | 166 m
	Last Updated: July 29, 5:15 AM Timezone: GMT -5/-4
	Sky Conditions: Clear	Temperature: 68°F | 20°C
	Pressure: 29.47 in | 998.1 mb	Dewpoint: 61°F | 16°C
	Humidity: 79%	Wind: NE 6 mph | NE 10 kph
	Feels Like: 70°F | 21°C	Visibility: 36.9 mi | 59.4 km
	Lat/Long: 38.5091 | -89.4358	Sunrise: 5:57 AM   Sunset: 8:11 PM

7 Day Graphical Forecast

Valid: 5:24 AM 7/29/2026

Tonight Clear 67 °F 1% Chance Precipitation Thursday Overcast 88 |65 °F 0% Chance Precipitation Friday Light Showers 81 |65 °F 67% Chance Precipitation Saturday Heavy Drizzle 73 |67 °F 67% Chance Precipitation Sunday Clear 81 |62 °F 29% Chance Precipitation Monday Clear 83 |64 °F 23% Chance Precipitation Tuesday Clear 85 |61 °F 13% Chance Precipitation

7 Hour Graphical Forecast

Valid: 5:24 AM 7/29/2026

5 AM Clear 68 °F 0% Chance Precipitation

6 AM Clear 67 °F 0% Chance Precipitation

7 AM Clear 68 °F 1% Chance Precipitation

8 AM Clear 70 °F 0% Chance Precipitation

9 AM Clear 73 °F 1% Chance Precipitation

10 AM Clear 75 °F 1% Chance Precipitation

11 AM Clear 78 °F 0% Chance Precipitation

7 Day Textual Forecast - with QPF, Max Wind, Humidity, Snowfall & UV Index

7 Day & Night Weather Forecast for St. Johns, IL - (Fahrenheit & Celsius) Valid: 5:24 AM 7/29/2026 Tonight Clear with a low around 67°F [20°C]. NNE wind to around 7 mph [12 kph], with gusts to near 15 mph [24 kph]. Chance of precipitation 1% with QPF of 0.00 in [0.0 mm]. Thursday Overcast with a high near 88°F [31°C]. NE wind to around 5 mph [8 kph], with gusts to near 14 mph [22 kph]. Dewpoint near 61°F [16°C] with humidity of 81%. Pressure around 29.47 in [998.1 mb]. UV Index: 7.3. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Thursday Night Overcast with a low around 65°F [18°C]. NE wind to around 5 mph [8 kph], with gusts to near 14 mph [22 kph]. Chance of precipitation 0% with QPF of 0.00 in [0.0 mm]. Friday Light Showers with a high near 81°F [27°C]. SSE wind to around 15 mph [24 kph], with gusts to near 29 mph [47 kph]. Dewpoint near 61°F [16°C] with humidity of 87%. Pressure around 29.47 in [998.1 mb]. UV Index: 6.95. Chance of precipitation 67% with QPF of 0.11 in [2.7 mm]. Friday Night Light Showers with a low around 65°F [18°C]. SSE wind to around 15 mph [24 kph], with gusts to near 29 mph [47 kph]. Chance of precipitation 67% with QPF of 0.11 in [2.7 mm]. Saturday Heavy Drizzle with a high near 73°F [23°C]. NE wind to around 16 mph [25 kph], with gusts to near 29 mph [47 kph]. Dewpoint near 61°F [16°C] with humidity of 99%. Pressure around 29.47 in [998.1 mb]. UV Index: 2.6. Chance of precipitation 67% with QPF of 0.16 in [4.0 mm]. Saturday Night Heavy Drizzle with a low around 67°F [19°C]. NE wind to around 16 mph [25 kph], with gusts to near 29 mph [47 kph]. Chance of precipitation 67% with QPF of 0.16 in [4.0 mm]. Sunday Clear with a high near 81°F [27°C]. NNE wind to around 14 mph [22 kph], with gusts to near 26 mph [42 kph]. Dewpoint near 61°F [16°C] with humidity of 98%. Pressure around 29.47 in [998.1 mb]. UV Index: 7.4. Chance of precipitation 29% with QPF of 0.00 in [0.0 mm]. Sunday Night Clear with a low around 62°F [16°C]. NNE wind to around 14 mph [22 kph], with gusts to near 26 mph [42 kph]. Chance of precipitation 29% with QPF of 0.00 in [0.0 mm]. Monday Clear with a high near 83°F [28°C]. ENE wind to around 8 mph [13 kph], with gusts to near 11 mph [18 kph]. Dewpoint near 61°F [16°C] with humidity of 96%. Pressure around 29.47 in [998.1 mb]. UV Index: 7.45. Chance of precipitation 23% with QPF of 0.00 in [0.0 mm]. Monday Night Clear with a low around 64°F [18°C]. ENE wind to around 8 mph [13 kph], with gusts to near 11 mph [18 kph]. Chance of precipitation 23% with QPF of 0.00 in [0.0 mm]. Tuesday Clear with a high near 85°F [29°C]. E wind to around 8 mph [12 kph], with gusts to near 15 mph [23 kph]. Dewpoint near 61°F [16°C] with humidity of 89%. Pressure around 29.47 in [998.1 mb]. UV Index: 7.5. Chance of precipitation 13% with QPF of 0.00 in [0.0 mm]. Tuesday Night Clear with a low around 61°F [16°C]. E wind to around 8 mph [12 kph], with gusts to near 15 mph [23 kph]. Chance of precipitation 13% with QPF of 0.00 in [0.0 mm].

---

7 Day and Night - QPF Forecast for St. Johns, IL

Tonight: 0.0 mm | 0.00 in

Thursday: 0.0 mm | 0.00 in

Thursday Night: 0.0 mm | 0.00 in

Friday: 2.7 mm | 0.11 in

Friday Night: 2.7 mm | 0.11 in

Saturday: 4.0 mm | 0.16 in

Saturday Night: 4.0 mm | 0.16 in

Sunday: 0.0 mm | 0.00 in

Sunday Night: 0.0 mm | 0.00 in

Monday: 0.0 mm | 0.00 in

Monday Night: 0.0 mm | 0.00 in

Tuesday: 0.0 mm | 0.00 in

Tuesday Night: 0.0 mm | 0.00 in

7 Day and Night - Maximum Wind Speed Forecast for St. Johns, IL

Tonight: NNE @ 12 kph | 7 mph

Thursday: NE @ 8 kph | 5 mph

Thursday Night: NE @ 8 kph | 5 mph

Friday: SSE @ 24 kph | 15 mph

Friday Night: SSE @ 24 kph | 15 mph

Saturday: NE @ 25 kph | 16 mph

Saturday Night: NE @ 25 kph | 16 mph

Sunday: NNE @ 22 kph | 14 mph

Sunday Night: NNE @ 22 kph | 14 mph

Monday: ENE @ 13 kph | 8 mph

Monday Night: ENE @ 13 kph | 8 mph

Tuesday: E @ 12 kph | 8 mph

Tuesday Night: E @ 12 kph | 8 mph

7 Day and Night - Maximum Humidity Forecast for St. Johns, IL

Tonight: 90 %

Thursday: 81 %

Thursday Night: 81 %

Friday: 87 %

Friday Night: 87 %

Saturday: 99 %

Saturday Night: 99 %

Sunday: 98 %

Sunday Night: 98 %

Monday: 96 %

Monday Night: 96 %

Tuesday: 89 %

Tuesday Night: 89 %

7 Day and Night - Snowfall Totals Forecast for St. Johns, IL

Tonight: 0.0 cm | 0.00 in

Thursday: 0.0 cm | 0.00 in

Thursday Night: 0.0 cm | 0.00 in

Friday: 0.0 cm | 0.00 in

Friday Night: 0.0 cm | 0.00 in

Saturday: 0.0 cm | 0.00 in

Saturday Night: 0.0 cm | 0.00 in

Sunday: 0.0 cm | 0.00 in

Sunday Night: 0.0 cm | 0.00 in

Monday: 0.0 cm | 0.00 in

Monday Night: 0.0 cm | 0.00 in

Tuesday: 0.0 cm | 0.00 in

Tuesday Night: 0.0 cm | 0.00 in

Contact Us | Mobile Private Policy | Terms & Conds | Consent Preferences | Cookie Policy Never base any life decisions on weather information from this site or anywhere over the Internet. Site is dedicated to our Lord & Savior Jesus Christ | Random Quotes of Jesus Copyright © 2026 El Dorado Weather, Inc. | Site Designed By:  Webmaster Danny